U.S. patent number 5,735,857 [Application Number 08/686,169] was granted by the patent office on 1998-04-07 for prosthetic gripping instrument.
This patent grant is currently assigned to Bristol-Myers Squibb Co.. Invention is credited to Richard A. Lane.
United States Patent |
5,735,857 |
Lane |
April 7, 1998 |
Prosthetic gripping instrument
Abstract
A prosthetic gripping instrument 10 for inserting or removing an
orthopaedic product 1. The instrument 10 has a first gripping jaw
20 which is pivotally attached and a second gripping jaw 30 which
is swivelably attached. This allows the instrument 10 to be used
with a wide variety of orthopaedic products having varying
geometries, such as various styles of hip stem implants or other
surgical products.
Inventors: |
Lane; Richard A. (Fort Wayne,
IN) |
Assignee: |
Bristol-Myers Squibb Co. (New
York, NY)
|
Family
ID: |
24755191 |
Appl.
No.: |
08/686,169 |
Filed: |
July 22, 1996 |
Current U.S.
Class: |
606/99; 606/207;
81/418 |
Current CPC
Class: |
A61B
17/8872 (20130101); A61F 2/4607 (20130101); A61B
17/282 (20130101); A61B 17/2833 (20130101); A61F
2002/3625 (20130101); A61F 2002/3631 (20130101); A61F
2002/4619 (20130101); A61F 2002/4622 (20130101) |
Current International
Class: |
A61B
17/88 (20060101); A61F 2/46 (20060101); A61B
17/28 (20060101); A61F 2/36 (20060101); A61B
017/88 () |
Field of
Search: |
;606/207,86,99
;81/418,387 ;433/159 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
0 207 873 B1 |
|
Jul 1987 |
|
EP |
|
0 408 109 A1 |
|
Jan 1991 |
|
EP |
|
0 450 007 B1 |
|
Sep 1991 |
|
EP |
|
2615-097-A |
|
Nov 1988 |
|
FR |
|
932366 |
|
Jul 1963 |
|
GB |
|
Other References
Universal Modular Femoral Hip Component Extractor-Innomed,
Inc.-c1995..
|
Primary Examiner: Thaler; Michael H.
Attorney, Agent or Firm: Geringer; Margaret L.
Claims
I claim:
1. A prosthetic gripping instrument for inserting or removing an
orthopaedic product, the instrument comprising a first elongated
arm and a second elongated arm, each arm having a proximal end and
a distal end, and wherein the arms are interconnected by a
connecting mechanism to allow the distal ends of each arm to be
moved toward or away from each other, one of said distal ends has a
first gripping jaw which is pivotally attached thereto and the
other of said distal ends has a second gripping jaw which is
swivelably attached thereto, wherein the first jaw is limited to
pivotal movement in a single plane about an axis of a pivot pin
which interconnects the first jaw to the one distal end, said axis
being nonperpendicular to a first gripping surface of the first
jaw, and wherein said swivelable second jaw provides multiplanar
adjustability.
2. The instrument of claim 1 wherein the second jaw swivels about a
spherical member which is interconnected to the other distal
end.
3. The instrument of claim 2 wherein the spherical member is
positioned in a complementary spherical cavity.
4. The instrument of claim 3 wherein the other distal end includes
a connecting member attached thereto wherein the connecting member
includes one of the spherical member or the spherical cavity
therein.
5. The instrument of claim 4 wherein the connecting member is
threadably attached to the other distal end.
6. The instrument of claim 1 wherein said second jaw has a second
gripping surface, wherein said first and second surfaces are
adapted for gripping opposite sides of the product.
7. The instrument of claim 6 wherein the surfaces for gripping
opposite sides of the product comprise a nonmetallic material.
8. The instrument of claim 1 wherein the connecting mechanism is a
connecting pivot pin member.
9. The instrument of claim 1 wherein the first and second elongated
arms include an adjustable locking mechanism therebetween to
control the amount of separation between the distal ends.
Description
FIELD OF THE INVENTION
This invention relates to the field of orthopaedic positioning
instruments. In particular, this invention relates to such
instruments for positioning implants or other surgical
products.
BACKGROUND OF THE INVENTION
In the field of orthopaedics, it is known to utilize various styles
of implant positioning instruments to either position or insert an
implant or to remove an implant or other such surgical device. For
example, many such instruments are secured to the implant or device
to be inserted by threading a rod into a hole in the device, such
as the following instruments for femoral hip implants: U.S. Pat.
Nos. 4,936,863 or 4,919,679.
Other instruments are attached to the neck of a femoral prosthesis,
such as in U.S. Pat. Nos. 5,064,427; 4,993,410; 4,792,339; and
4,642,121. In U.S. Pat. No. 5,476,466, a locator post is provided
for insertion into a transverse hole in the proximal portion.
These positioning instruments are typically designed to accommodate
a specific geometry on a particular product.
SUMMARY OF THE INVENTION
The present invention provides an orthopaedic positioning or
gripping instrument for inserting or removing an orthopaedic
product. The instrument has a first elongated arm and a second
elongated arm interconnected by a connecting mechanism which allows
the distal ends of each arm to be moved toward or away from each
other. One of the distal ends has a first gripping jaw which is
pivotally attached thereto, while the other of the distal ends has
a second gripping jaw which is swivelably attached. This allows the
instrument to be used with a wide variety of orthopaedic products,
such as hip stem implants having varying geometries. The pivot and
swivel jaws enable the instrument to grip two opposite surfaces of
a product, and enables those surfaces to have various
configurations, angles, dimensions. The combination of the pivot
jaw and swivel jaw provides control and stability.
Accordingly, it is an advantage of the present invention to provide
a novel instrument for gripping a wide variety of orthopaedic
products of varying shapes and sizes.
Another advantage of the invention is to provide a gripping
instrument which includes a pivot jaw and a swivel jaw to provide
adjustability to grip orthopaedic products having various shapes
and sizes.
A further advantage of the invention is to provide a simple
instrument for gripping an orthopaedic product.
Still other advantages of the invention will become apparent upon
reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the instrument of the present
invention.
FIG. 2 is a side view of the instrument of FIG. 1, shown gripping a
femoral implant device.
FIG. 3 is a cross-sectional view of the first pivotal jaw of the
instrument of FIG. 1.
FIG. 4 is a partial cross-sectional view of the second swivelable
jaw of the instrument of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment described herein is not intended to be
exhaustive or to limit the invention to the precise form disclosed.
Rather it is chosen and described to best explain the invention so
that others skilled in the art might utilize its teachings.
Accordingly, FIGS. 1-4 illustrate a preferred embodiment of a
gripping instrument in accordance with the present invention. This
invention relates to instruments for gripping or positioning an
orthopaedic implant or other suitable surgical device. The
invention will be described for use with a prosthetic femoral hip
implant; however, it is understood that the invention is not
limited thereto, and that the instrument could be adapted for
positioning other implants or surgical devices.
The instrument 10 includes a first elongated arm 11 and a second
elongated arm 12 interconnected by a connecting mechanism 13. Each
arm 11 and 12 has a proximal end 14 and a distal end 15. The
connecting mechanism allows the distal ends of each arm to be moved
toward or away from each other. The connecting mechanism 13
utilizes a connecting pivot pin member. One of the distal ends 15
has a first gripping jaw 20 which is pivotally attached thereto.
The other of the distal ends 15 has a second gripping jaw 30 which
is swivelably attached.
The first jaw 20 pivots about an axis of a pivot pin 22 which
interconnects the first jaw 20 to the one distal end 15. The second
jaw 30 swivels about a spherical member 32 which is interconnected
to the other distal end 15. The spherical member 32 is positioned
in a complementary spherical cavity 33. The other distal end 15
includes either the spherical member or the spherical cavity
therein with the other of the mating spherical member and cavity
being provided on the swivelable jaw. The other distal end 15 may
include a separate connecting member 34 attached thereto which
includes the spherical member or mating cavity. FIG. 4 illustrates
the spherical member 32 on the connecting member 34, with the
cavity or socket 33 in the second jaw 30. The connecting member 34
may be conveniently attached to the other distal end 15 via threads
35. Hex socket 36 is provided in connecting member 34 for threading
member 34 into the other distal end 15. The second jaw 30 may be
swaged onto spherical member or ball 32, although any suitable
method may be used to provide this swivelable ball and socket joint
32 and 33, thus allowing swivelable motion about the spherical
member 32.
Each jaw 20 and 30 has a surface 28 and 38, respectively, for
gripping opposite sides of the product 1. In FIG. 2, the instrument
10 is gripping the anterior and posterior surfaces of a femoral
stem implant between the neck and collar of the implant. The
instrument 10 may be advantageously used to grip or hold the
femoral implant while inserting the stem into bone cement. The
swivel and pivot jaws are able to adjust to the geometry of the
implant to grip it securely. The pivot jaw 20 prevents rotation in
the medial/lateral plane of the femoral implant when the instrument
10 is gripping the anterior and posterior surfaces of a femoral
implant as shown in FIG. 2. The swivel jaw provides
multidirectional adjustability. The surfaces 28 and 38 may be flat,
as shown, or contoured (not shown), as desired. The instrument is
preferably made of metal, such as stainless steel, although any
suitable material may be utilized. The surfaces 28 and 38 may
include a nonmetallic material to protect the implant being gripped
or to improve the security of the grip. This nonmetallic material
may be either a nonmetallic cap over the gripping surface or a
nonmetallic o-ring embedded in the surface of the jaw or a
nonmetallic coating or layer (not shown). Silicone or any other
suitable nonmetallic material may be used. Alternatively, the whole
jaw may be made of a nonmetallic material, if desired, and as such,
manufactured by any suitable method.
The first and second elongated arms 11 and 12 may include an
adjustable locking mechanism 50 therebetween to control the amount
of separation between the distal ends. A threaded locking mechanism
50 as shown in FIGS. 1 and 2 may be used for this purpose, although
any suitable locking mechanism can be used.
While this invention has been described in terms of a particularly
advantageous embodiment, those skilled in the art can appreciate
that modifications can be made without departing from the spirit
and scope of this invention.
* * * * *